Introduced in 1964. Chambered for .41 Magnum cartridge. Built on N frame. Offered in 4", 6", and 8.375" barrel lengths. Blued frame and adjustable sights. Model designations are: 57-1 1982; 57-2 1988; 57-3 1990; 57-4 1993. Add 25% for nickel finish; 100 percent premium for pre-1969 model with "S" serial number prefix. Six engineering changes.